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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e12da9f0a1af5271f7d9fd21ce59d2741cdf70ad4f1d4d43aa8a36b254b599e2' 
  AND token = 'p/YqMk3Wp9G1nuTlLVH689u9uyhLcEyONGu9hEGv49A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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