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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93adb8711f6b189a94f864ded06a60f7bf9a12e84da72366343bbd7079e57b3e' 
  AND token = '/qdonSRhAhQzRy04tdLiQmukOLJ1zCwU4cD7z3xp5gM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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