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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75bbdd153f17cde9572d3ce1e64a4716273226160c31cbbeb75cf6e6182f2a6d' 
  AND token = 'wk4OHwo8Om1ik3GyJtHNUoxj7DYTBHp0XINdEww5NK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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