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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68f8b72bce7381a8d2daeb3a08844a4903566c2e8128c5332dfa0fe5728890a1' 
  AND token = 'H5SoPU9VU50q4p8811A2/gXJ337e4ZfNUZcT5NVSoV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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