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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0f9a40a2a84a74f31e70a69f8f585c550e3b96e9662aefa976d37b28b42a8e4' 
  AND token = 'eIj/Q0RWQpas/b1eDYpmrjTXZcu1JUaP3OrIM8tkt5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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