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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5698766e076e865e8332fc41d499bf43ba56a0eec7e0dddae4c21339890bb02' 
  AND token = 'FOM3xc4rIGW9WB1vtz7Lf2nES9ICpyAyn3PXbQDrKTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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