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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '269a0491ba4f6a01a0d7953941bdea99477fd23f43259ef80d5685211325dfe3' 
  AND token = 'rdJly7KV10qL7kLl5hl0kvhGhnpvaqgzdpMXSnSGEYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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