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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fe893de985752bbc36d308ca2db760baa4a340a50060e0f4946c4940e05680c' 
  AND token = 'ST11g2zn9oIciiFQ5BxreS5WHYBU2+C2T6BBv+JaW3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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