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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e3f48800728bf3811a9ae8f39d810521fd37a848b966414378d1a33c5806d48' 
  AND token = 'sDqIDacEkpqYEAiXNZuUE1Vm1qunklzRJyC7mRfFRyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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