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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ae43ef9cf503e1a7cabb51d4ecde8b924d992577ba6d195517bd82f744e120c' 
  AND token = '1N1Qe4+M2Ojvf/8IRlkJ8EmYG1jMZfqwrD6AFaUBTUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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