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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0d6240ebdd85968914decf251e4c95d6e173324da6483e3e5d00f81686d4451' 
  AND token = 'tfZ2BVNPL8jT4fm1dR+cxeULyss1W9E7iJEI56/XeU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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