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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8175163ab0f9abd04612867019486faaa206d47e423b23c505d94c2844c62691' 
  AND token = 'aR9vzE7pMkKRapCJlXZDJ1/E1vOyfYm9CX5qM0lQlmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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