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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cae2e609b875aaf55c3883199e4d113de749cce7763f16aaa3e4fd7f5ff0504' 
  AND token = 'gVn9Nz2/MHiVi/erK8HLSxcHydnlZRm36iSn/DOxc30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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