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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62c762769c4116328c8533971bf1fa0d5bb06bd5f123aff63e6701a709de78a7' 
  AND token = 'muwqicwhA1/+RTsHwWrkgvf6hw5Hmlb9lcS/D1pwR5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00097

JSON explain

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