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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aec9101f10715114d547fbe3a5e55bd7f4776d9185c40a93ca3dba8d4a64dc9f' 
  AND token = 'ky3rVNwnxC+GyXUOQ9rMyGpUg8G/8UneyBoy6Ye2N/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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