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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77480b5603e80b531507713be8e67a5c3055244fa8a37c6259843e5dceae50a6' 
  AND token = 'ddnuMBDqr7XF2Mp6XflqyGQIb5XpPTH9OD1+m4L+brc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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