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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f525743b91631c45ccccc193a81b7cacaf4828a54328149d24e2a545c3c385e' 
  AND token = 'vXdx1gTHRlvz3uTuFe0joaM8HOlFS8kU0HjWZgkIPzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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