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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95d452169b617371f046cf64255ee0d6718d401a1fe42b5e77332797fa47c6bf' 
  AND token = '/Ek5NMtiHAzw1D1j60UL4Wa/oHtU4ISC359mEXqUgGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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