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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c3c54bb4df09a6dbf90c0da029f694fed83c9587827f09ab45e2aee3a3bdd3d' 
  AND token = 'GERdp4qHfzNvwU7f+JkpEW1z2H3mlMc8DPV32ckpf3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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