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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8084367e746f9ea87ed329bbfdb4a817d4221e69a1d18d1d7bf5bdb645a39432' 
  AND token = 'gBKxNExNNm5eWo+9MfgPeZY/TOOlykM3rrJdZ3QCrRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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