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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92e31e895205659b9f1290b5a2256da715a11e79d3129edb0589aba66534b108' 
  AND token = 'jSk/6uNzB/Y+WuRhLhKfXUSdaJ0MXrw/so0gu1YksyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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