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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11a671d33a5e78a0ddb227c315738e6cedd1d9c668724c9d3d46111624ea9d4b' 
  AND token = 'pCTIn7bJs2pE2Q8mznjuC//JNb1LO9uZNgJX1RwFXL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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