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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebf7acacb705f7f8b81c69def12c41aaea103fc9fb338f3d64abb690d2f83010' 
  AND token = '1aLYQ9YbrNdc6dBoT8vItN9h4L6DLtclAoJx76Q16QQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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