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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d0ae29e3334cd247d49a5feef512463241f175a4d67385a8a221b7366ca2a00' 
  AND token = 'OFLLbG0GIdWBZiNlqMl61oemfki9tm5PGU3AVzZu6i4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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