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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c22b665581c2545cbae8f734670a352ecc13d55ce162305b3b1a0a5d1a34ed0e' 
  AND token = 'LWxfJu2rbkJ34GxJCm0O1DxqPH9VCSw7BAooXgfscM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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