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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '199cc8f554f8170e8bb84f14b162c5cef8dee758d5e9c3ef0213683661cb0cfc' 
  AND token = 'RKNj1M1MopBNh2CIjRyeFWMjt7kbmR/Esr923W5zPt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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