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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93ba7210204dfad472df51dc32bedba602ad5dccdbc3b643ee8b3ef1186a70c8' 
  AND token = 'TB7NagQ8Z6e7jeQw4YehslwgFGhuUjwFpQpm4yZwuI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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