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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60ecaa10c9d20e292ad5d4a911352ba5a02e843bd01cbc79f6aa9d3302af5759' 
  AND token = '/Q3txxDR39ehRTpuwEKiHAPFoixmlrtL9+a1cQOlncE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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