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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e0d318504f09c7e182ff923d906f547ec6d2abd4b29693fe86e75fc2cf8cd42' 
  AND token = 'a5BQ+QdexTH/NNucM9xCaODqn1yoeGzhq46YPJBf3PE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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