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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ec627274b2658f27bcf11062c2fa848984fd8b77fad70fd8f81e329aa684c30' 
  AND token = 'Q5ySZ6a/FPfOG5En/EgnBNb/36B8r4cuBV8NI7+KuKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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