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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58c2e07d70c57e913138aa76ec20b7dd77f38e8a9f0e12dd9382b1a39a343079' 
  AND token = 'wFpjzmQ/P6l9JYftfsgdXJTcxEUNazJCbIxWJfayTfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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