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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d10e5299c4828fa0e54fb3f8e1ff024b1d10a2e9fe0e685e637238031ba07f2' 
  AND token = 's9J/cZrO2BDSAdZk2fyvi/wEGYxkEVgePDOEot+43iQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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