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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29f05408a8f2e74963c0130b6131e49605fd68e27206caccac85a82be281fec6' 
  AND token = 'BNR3oFgO2QeUKYl1WbN2H5ZH+DGTzxl+PmN94FFwg4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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