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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c4fe999ce8330f5a51922ccf848e67fcfd0b48d9fa109600d06f229319582f1' 
  AND token = 'K1lAI0IXptK8rsIwFvkgpfruMO8Q6pdej/2poGsBYvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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