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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6abe4e7cbdb0ab0b69a11a229d4869792714ba85ea055502e12c34976ccfdd45' 
  AND token = 'oXJ8Hr/zOoTviqxcGUHDu4yNNCHp6JwoxW04fXKugb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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