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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de2430bc820760776ce0a064cca4bd6686017c5f483390fd67077ffe801dcea7' 
  AND token = 'JqQiJj1dWWjIXmI6mVJJTHaW3Ukh3kj1rPE6xvTge+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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