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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f7bc838d7a77fe2ced05eb819155b970f6b970b9b4045811bedc617ca5253b7' 
  AND token = 'pkLNzc/yFOpkS+YRzLD1g2MU8vnJ3wDqGJNw1k012O4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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