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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06b61eba8a6c6cb7b2ed18b9a7d07f02760ad9109a72f260cc28c055c23727c4' 
  AND token = 'vPMrzp1EZnRVdoeDpqORF7SsoMF4NvfqzB1TdcWYQRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}