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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '532fa166916a22f95e06b18ce504cfd3891e121972cfc39fadd45303836f92ef' 
  AND token = 'EbUaMsiv0zCiaa+K1ERUhfV7Z0dpADJsPSckFnXtVA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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