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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1f33997ded4dbf8dad4d89dd49ba1cf87b05dd660cd82b180241b17aeab3320' 
  AND token = 'VRt7Q+6SjcPsUlkRfanveI2X+f+6Xr6L7mgx/pxk6r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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