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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6275aac95f1cf9554f3f9310731560dc119d8d40de20d3707fac1188ef2d7816' 
  AND token = '2BfFgCgJhbRrMemRVZHPv7m3XnoAkkD5Q6A1r/kpWEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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