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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5962466321ba2a9dd123c393a9476efc1c78d4dceeb307dbcb0b9170efbcdde' 
  AND token = 'tWmThFt4iX1SW5vndfhmpUboUdYLw6Q+q68SGWlP4kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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