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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39f00ffba703c9ead0fb6c3bc1b6e3e980b70948d3febf7ff44ad1dfd6739612' 
  AND token = 'BZ02cydgGzVqkOAnt3I+fAWWFGCGMn46v/0fbe2pbtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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