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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc1121485efaef3003caba280fb42b94f9cbd599959fa7b4b2540420f8cc58c8' 
  AND token = '8w8DeTmW/O4TqZK6Zr2VEqAwi9y8U6RSEwAOaopKdTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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