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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f86d65141ac3ff7347c2bba12fd58f79259e3c651a678c541055794a7990f97' 
  AND token = '20Y1523vSejOctvJskpuomghDwYXZ3iXuCyifTLy6p4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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