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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '378485cb933f02b7c9ac019956782ebec4d6ffb054d8d3ec0ade55398ebef709' 
  AND token = 'Wx2ca9wVpBCNaakjq1DGql92UQ1znlzoc4XFL0Smgks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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