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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4eebc28d44d50464233cd492be69ce7d0f94511908b867db69747a1684fe6b5' 
  AND token = 'MNQILIjNcPJSEdp1GurFOi0p82RVaMgnEPCj3p/SGwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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