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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1898b71bd8b0c5c69c57d822692f36d2f5d6255e1f1314b7d9e717842ca9387' 
  AND token = 'c2kleoQA5REMH6qtRFUb4ytZq0VFJRoxEjJjE8+cO2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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