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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fb95a85dc6c00bd7b2d458deb262cdfd71910e603ae691e9efb522ba4e7c738' 
  AND token = 'Gl/sJA0oomNXheApkqQr1BQ3HMSFlEdCaYduZq0BG3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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