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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceb89d4dfc46a0f976cf9fdf348cbc8aeaa59f833d2b16f9e7830a8a27b19272' 
  AND token = '3z1vR26I8lXsjIlAQR/s/HCEcEe/bh0iuIeoppYhOpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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