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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00672050a24e79443bcd5ff5d838e74819742032f02723ba86b7ad0196a66a22' 
  AND token = 'Rp1gkdmBiOleKU5TtVB8ZvBQCCHs9SIKtjCNNmh2gd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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