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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd92416f191effe75b82f40114f3d05e0cc36ecaeee7f1c6e7934f752f1866f6f' 
  AND token = '5CgVWdLb+maztuBm7jMzwmmvtxNmOf7WX/he20/gDLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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