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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3613b5acea1fb620ac8306bfe21beb866460f206f79dd5eaf43bb54c0fefeb82' 
  AND token = 'oCZgUTKjhYC754yT8RE23If8HRL+ys5Du5WByk529UA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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