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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23e73675766627bd1017651e7a4c3e0ece1f236d3ee51ca6a7a14b78e85d381e' 
  AND token = 'Yh008ZGIWAxrl0GheE1Dthnen16bw1oIdy1bI4kka98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00103

JSON explain

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