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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc65933e1fbdfeb2c3f2fbde2fce046b7dc2064dfdc081f9d63b6e1137c469a4' 
  AND token = 'wccSULnuKMBQqyrwYtb/iJOTKnhqXY+W8xBV40yCKOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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