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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e42d7d44c2f2a4a332b3dd4570fba9e7faea2fcc4777be94eca93c6d9be754a4' 
  AND token = 'rquxFVE24mJdJSmJEa+BsK8Z8Ri/Gd2kXWMZsLUOw4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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