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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b13c9a18a12ff38d3c74e94dff2acdf1ad152cf1bc999693eccf04698394b5be' 
  AND token = 'WL+dc0yBVnm/fWsT3Cezk+6I2/NnLKbirZRDCZk75gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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