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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd209ee4ebfb001ebdddabe7c1b77acc41d8239b7ba229dd452770bf0998ea82a' 
  AND token = 'jYtNfRExtL0WkzkiT3KAEqJd6T3Sqzrj/VVqqjHX4t0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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