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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2529fd2a21a5e00ed87374c24a64b4b4d6c6b572d5de42c0267e1a29b2f9b8f8' 
  AND token = '4VkHJbBK8HRg+8YsRYfv+o4aQrgG16pBp/Vt+WT4dX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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