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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b93b523a998f8ca56cd7ad7c091f3d74e33a6228fc8c3e6f2993ca62efb5e2d5' 
  AND token = 'FXEjIT70krJ3VqnEPYT3tU75wChpPGNGdb4PTz/YArE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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