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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81df0f6fca52565dd37f8a6ff08612ec5e69131b0454fa0e9ccaad2b37cef5fc' 
  AND token = 'bwV7auDsJ+WekVP7VDL1h0K7e40nsaCFOGDH/MR1Qi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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