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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d1053b8eaf7d69d46cdafca05d3f6afc224a2bf71c1b382bbe2961e0d81956e' 
  AND token = 'tVkaGobqFgMHUOLepNxOb3JpBlD47/Dtebz/LmJhcnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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